jumbo machinder gaiking?

i have been sitting on a japanese jumbo machinder gaiking for 8 years now. just sitting in a box. im interested in selling it but have no idea the value? its the japanese shampoo bottles version. i can post photos if interested. years ago i saw it go on ebay for $300 but that seemed high to me. any ideas or anyone interested? id grade it c8 overall. thanks for the input